answersLogoWhite

0


Best Answer

An integer is a perfect number if it is equal to the sum of its positive divisors, not including the number itself.

The divisors of 28 are : 1, 2, 4, 7 and 14....and these sum to 28. Thus 28 is a perfect number.

In Number Theory there is a theorem that, If 2k - 1 is prime then 2k-1(2k - 1) is perfect.

If we put k = 3 then 2k - 1 = 23 - 1 = 8 - 1 = 7 is prime.

And, 23-1 (23 - 1) = 22(8 - 1) = 4 x 7 = 28....is the resultant perfect number.

User Avatar

Wiki User

11y ago
This answer is:
User Avatar

Add your answer:

Earn +20 pts
Q: Is 28 abundant deficient perferct or near perfect?
Write your answer...
Submit
Still have questions?
magnify glass
imp
Related questions

Is 50 near a perfect number?

No, it is not near a perfect number. The first four known perfect numbers are 6, 28, 496 and 8,128.


Is 50 a near-perfect number?

No, it is not near a perfect number. The first four known perfect numbers are 6, 28, 496 and 8,128.


In Benjamin Franklin's opinion the final constitution created by the delegates can be summarized as?

as near perfect as possible


What resource is abundunt near the shores of the Persian gulf?

Oil is abundant there.


Is the leopard seal abundant near Antarctica in summer months?

Yes.


Is number 87 near perfect?

No, it is not: nowhere near!


Is 11 a near-perfect?

No


When did Armando Galarraga's near-perfect game happen?

Armando Galarraga's near-perfect game happened in 2010.


What is an example of a near-perfect number?

an example of a near perfect number is 2, 4 or 16.-these are near-perfect numbers because their factors add up to one less than the number itself.


What does near mint mean?

Near mint means about 90% perfect condition, and about 10% unperfect. Near mint can appear on most things(usually things people are trying to sell) so if you see near mint, it means it is about perfect as the item is claimed to be. NOTE: "Mint" means perfect, "Near Mint" means almost perfect.


What is the difference between perfect specular reflection and near-perfect specular reflection?

In the perfect specular, the reflected ray is determined by the angle the incident ray makes with the surface normal. which means it is fully predictable. In the near perfect, the reflected ray will be near the same of the perfect, but not the same. In a difuse reflection, the ray is far from being equal to the perfect specular.


Is 17 a near perfect number?

no